title: Analysis of in vitro insulin-resistance models and their physiological relevance to in vivo diet-induced adipose insulin resistance.
abstract: Diet-induced obesity (DIO) predisposes individuals to insulin resistance, and adipose tissue has a major role in the disease. Insulin resistance can be induced in cultured adipocytes by a variety of treatments, but what aspects of the in vivo responses are captured by these models remains unknown. We use global RNA sequencing to investigate changes induced by TNF-α, hypoxia, dexamethasone, high insulin, and a combination of TNF-α and hypoxia, comparing the results to the changes in white adipose tissue from DIO mice. We found that different in vitro models capture distinct features of DIO adipose insulin resistance, and a combined treatment of TNF-α and hypoxia is most able to mimic the in vivo changes. Using genome-wide DNase I hypersensitivity followed by sequencing, we further examined the transcriptional regulation of TNF-α-induced insulin resistance, and we found that C/EPBβ is a potential key regulator of adipose insulin resistance.
authors.affiliation: Department of Biological Engineering, Massachusetts Institute of Technology, Cambridge, MA 02139, USA; Whitehead Institute for Biomedical Research, 9 Cambridge Center, Cambridge, MA 02142, USA.
authors.forename: Kinyui Alice
authors.initials: KA
authors.lastname: Lo
authors.forename: Adam
authors.initials: A
authors.lastname: Labadorf
authors.forename: Norman J
authors.initials: NJ
authors.lastname: Kennedy
authors.forename: Myoung Sook
authors.initials: MS
authors.lastname: Han
authors.forename: Yoon Sing
authors.initials: YS
authors.lastname: Yap
authors.forename: Bryan
authors.initials: B
authors.lastname: Matthews
authors.forename: Xiaofeng
authors.initials: X
authors.lastname: Xin
authors.forename: Lei
authors.initials: L
authors.lastname: Sun
authors.forename: Roger J
authors.initials: RJ
authors.lastname: Davis
authors.forename: Harvey F
authors.initials: HF
authors.lastname: Lodish
authors.forename: Ernest
authors.initials: E
authors.lastname: Fraenkel
mesh_terms: D000273:Adipose Tissue / Q000378:metabolism*; D000818:Animals; D004195:Disease Models, Animal; D006801:Humans; D007333:Insulin Resistance / Q000502:physiology*; D051379:Mice; D014409:Tumor Necrosis Factor-alpha / Q000502:physiology*
chemical_list: D014409:Tumor Necrosis Factor-alpha